77670381 has 8 divisors (see below), whose sum is σ = 107131680. Its totient is φ = 49994672.

The previous prime is 77670371. The next prime is 77670391. The reversal of 77670381 is 18307677.

It is an interprime number because it is at equal distance from previous prime (77670371) and next prime (77670391).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77670381 - 2¹⁸ = 77408237 is a prime.

It is a super-2 number, since 2×77670381² = 12065376169370322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77670301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446295 + ... + 446468.

It is an arithmetic number, because the mean of its divisors is an integer number (13391460).

Almost surely, 2^77670381 is an apocalyptic number.

It is an amenable number.

77670381 is a deficient number, since it is larger than the sum of its proper divisors (29461299).

77670381 is a wasteful number, since it uses less digits than its factorization.

77670381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892795.

The product of its (nonzero) digits is 49392, while the sum is 39.

The square root of 77670381 is about 8813.0801085659. The cubic root of 77670381 is about 426.6631596256.

The spelling of 77670381 in words is "seventy-seven million, six hundred seventy thousand, three hundred eighty-one".